沥青混凝土路面可靠性水平评价研究

基于材料的性能衰变机理,对材料的抗剪切、抗温裂、抗疲劳、抗水损强度衰减规律进行了研究,建立了强度性能衰减与保有系数分布密度函数的关系模型,并通过材料内部损伤可靠性水平和表观破损状况对该模型进行修正,实现了通过表征强度性能衰减分布规律的可靠性水平对路面状况进行评价.研究表明:当抗剪切、抗温裂可靠性水平均低于0.85,或者抗疲劳、抗水损可靠性水平均低于0.75时路面将发生剪切变形、温裂、疲劳、水损害等病害;而总可靠性水平低于0.65时,需要实施预防性养护;抗水损可靠性水平不低于0.65时进行防水处治,使得对路面进行大中修的开始时间推迟30%以上.

Research on Reliability Evaluation of Asphalt Pavement

Surface failure is correlative to the material performance of structure layer,and strength decay attenuation law of the anti-shear,anti-cracks,anti-fatigue and resistance Moisture Damage are researched based on decay mechanism of the materials,and the relation model of strength decline and its Distribution Pensity Function is established.At the same time,the model is amended by the failure level and surface damage index.So the pavement can be evaluated by the reliability level that represent the structure strength attenuation law.It shows that the shear,cracks,fatigue and moisture damage occurr on the pavement when the reliability level of anti-shear,anti-cracks are all less than 0.85,or anti-fatigue,resistance of moisture damage are all less than 0.75.Otherwise,if waterproof treatment should be implemented in time when reliability level of resistance moisture damage is more than 0.65,the begining time of large and medium pavement maintenance can be delayed for 30%.